As no-one appears to be assisting with fault finding on Whirlpool dishwashers anymore, here is a link I have found to Service Manuals for the dishwashers. Hope it helps you fault find.
https://www.manualslib.com/brand/whirlpool/dishwasher.html
https://www.manualslib.com/brand/whirlpool/dishwasher.html